clear cookies for html object

Hi,

I'am using the facebook as3 api to upload a picture on the users facebook page. To clear the field user name on the login page call I clear the browser cookies via

RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 2

works fine most of the times. But sometimes the process hangs and may be not executed on the right time. Is there a more efficient way to clear the cookies?

TIA